Tidligere arrangementer - Side 43

Prof. Sofian Audry, from University of Quebec in Montreal, will speak at RITMO's Seminar Series.

Maksym Brilenkov, PhD student at Institute of Theoretical Astrophysics, University of Oslo.

Counterexamples to the integral Hodge conjecture can arise either from torsion cohomology classes (as in Atiyah's and Hirzebruch's original counterexample from 1961) or from non-torsion classes (as first seen in Koll¨¢r's counterexample from 1991). After Voisin proved the IHC for uniruled threefolds, Schreieder found a unirational fourfold where the IHC fails. His construction of a non-algebraic Hodge class relies on abstract arguments with unramified cohomology. It was an open question whether this class is of torsion type. In this talk, I want to explain a new method that gives an explicit geometric description of the unramified cohomology class appearing in his argument. In particular, this approach allows to prove that Schreieder's unirational counterexample is of torsion type.

Felleskollokvium ved ?yvind Guldbrandsen.

Ellen Rees har hatt en raptus i sommer og sittet og lest franske og danske vaudeviller og andre lettbeinte komedier. Basert p? dette materialet vil hun n? demontere to myter om Ibsen og fortelle om to ?funn?. Velkommen til litter?rt instituttseminar onsdag 16. november kl. 14.15!

This year's Hassel lecture is headed by Professor Marc Fontecave. 

This year's Hassel lecture is headed by Professor Marc Fontecave. In this lecture, Professor Fontecave will use the case of France as a springboard to discuss the current energy situation, the different scenarios for the 2050 trajectories and the scientific and technological challenges that we must face.

By Prof. Levi Yant from the University of Nottingham, UK

In this talk, I will go through my past research before joining UiO, particularly at The University of Texas at Austin. This will include a brief introduction to the development of stable and adaptive finite element methods for challenging problems in engineering science. Second, I will focus on modeling efforts in coastal ocean hydrodynamics, including a review of the underlying physics and assumption and a review of the current state-of-the-art. I will also introduce several related to my focus of storm surge modeling and how the models are used by stakeholders beyond academia. 

Renate Mauland-Hus, PhD student at Institute of Theoretical Astrophysics, University of Oslo.

How do consulting firms influence global health politics? In this seminar, Assistant Professor Tine Hanrieder will present research on consulting firms' role in WHO reform and discuss how it raises new questions about WHO's convening power.

V?re skolesystemer og pedagogiske virksomheter m? reflektere radikalt over hvordan de har bidratt til at livet p? jorda befinner seg p? randen av katastrofe. Det mener Birgit Schaffar-Kronqvist fra Universitetet i Helsinki.

As a consequence of the S-duality conjecture, Vafa and Witten conjectured certain symmetries concerning invariants derived from spaces of vector bundles on a closed Riemannian four-manifold. For a smooth complex projective surface X, a satisfying mathematical definition of Vafa-Witten invariants has been given by Tanaka and Thomas. Their invariants are a sum of two parts, one of which can be defined in terms of moduli spaces of stable vector bundles on X. Focusing on this instanton part of the VW invariants one can ask how it changes under blowing up the surface X. I will discuss joint work with Oliver Leigh and Yuuji Tanaka that answers this question.

- Modellering og analyse av renterisiko i en post-Libor-verden med ESG. 

- Matematisk institutt ved Universitet i Oslo tilbyr et to-dagers etterutdanningskurs i renterisiko ved David Banos og Fred Espen Benth.

I will explain how a recent ¡°universal wall-crossing¡± framework of Joyce works in equivariant K-theory, which I view as a multiplicative refinement of equivariant cohomology. Enumerative invariants, possibly of strictly semistable objects living on the walls, are controlled by a certain (multiplicative version of) vertex algebra structure on the K-homology groups of the ambient stack. In very special settings like refined Vafa-Witten theory, one can obtain some explicit formulas. For moduli stacks of quiver representations, this geometric vertex algebra should be dual in some sense to the quantum loop algebras that act on the K-theory of stable loci.

By ?ric Coissac from the University of Grenoble, France

In this talk, professor of design history Dr. Kjetil Fallan, explores design interventions at, and in the wake of, the United Nations Conference on the Human Environment in Stockholm 1972. What can design activism tell us about the conference's influence on future political decision-making? Or about the development of environmental thinking and ecologically informed design ideology in Scandinavia?

Welcome to this seminar with Tumaini Malenga from The African Institute for Development Policy, Malawi.

Regjeringens nye mannsutvalg har f?tt et bredt mandat. Med dette seminaret ?nsker vi ? vite mer om utvalgets prioriteringer og hvordan forskning vil spille en rolle i utvalgets arbeid.

By Geir H. Bolstad from NINA, Trondheim.

When a body (such as an offshore structure and ship) exists on the surface of the ocean, it is influenced by waves. At the same time, waves are deformed by the body. This interaction is essential for considering the problems of bodies in waves. Although these are complicated systems, the theory is well-established based on linear potential flow, and this explains these phenomena very well.
In the seminar, some applications of potential theory-based analysis are shown, including the seakeeping of a ship, multi-bodies interaction, and elastic plate in waves. In addition, the progress of the study of wave-ice interaction in a marginal ice zone is presented which is a current work in UiO.